Visualization Library 2.0.0-b5

A lightweight C++ OpenGL middleware for 2D/3D graphics

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jmorecfg.h
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1 /*
2  * jmorecfg.h
3  *
4  * Copyright (C) 1991-1997, Thomas G. Lane.
5  * This file is part of the Independent JPEG Group's software.
6  * For conditions of distribution and use, see the accompanying README file.
7  *
8  * This file contains additional configuration options that customize the
9  * JPEG software for special applications or support machine-dependent
10  * optimizations. Most users will not need to touch this file.
11  */
12 
13 
14 /*
15  * Define BITS_IN_JSAMPLE as either
16  * 8 for 8-bit sample values (the usual setting)
17  * 12 for 12-bit sample values
18  * Only 8 and 12 are legal data precisions for lossy JPEG according to the
19  * JPEG standard, and the IJG code does not support anything else!
20  * We do not support run-time selection of data precision, sorry.
21  */
22 
23 #define BITS_IN_JSAMPLE 8 /* use 8 or 12 */
24 
25 
26 /*
27  * Maximum number of components (color channels) allowed in JPEG image.
28  * To meet the letter of the JPEG spec, set this to 255. However, darn
29  * few applications need more than 4 channels (maybe 5 for CMYK + alpha
30  * mask). We recommend 10 as a reasonable compromise; use 4 if you are
31  * really short on memory. (Each allowed component costs a hundred or so
32  * bytes of storage, whether actually used in an image or not.)
33  */
34 
35 #define MAX_COMPONENTS 10 /* maximum number of image components */
36 
37 
38 /*
39  * Basic data types.
40  * You may need to change these if you have a machine with unusual data
41  * type sizes; for example, "char" not 8 bits, "short" not 16 bits,
42  * or "long" not 32 bits. We don't care whether "int" is 16 or 32 bits,
43  * but it had better be at least 16.
44  */
45 
46 /* Representation of a single sample (pixel element value).
47  * We frequently allocate large arrays of these, so it's important to keep
48  * them small. But if you have memory to burn and access to char or short
49  * arrays is very slow on your hardware, you might want to change these.
50  */
51 
52 #if BITS_IN_JSAMPLE == 8
53 /* JSAMPLE should be the smallest type that will hold the values 0..255.
54  * You can use a signed char by having GETJSAMPLE mask it with 0xFF.
55  */
56 
57 #ifdef HAVE_UNSIGNED_CHAR
58 
59 typedef unsigned char JSAMPLE;
60 #define GETJSAMPLE(value) ((int) (value))
61 
62 #else /* not HAVE_UNSIGNED_CHAR */
63 
64 typedef char JSAMPLE;
65 #ifdef CHAR_IS_UNSIGNED
66 #define GETJSAMPLE(value) ((int) (value))
67 #else
68 #define GETJSAMPLE(value) ((int) (value) & 0xFF)
69 #endif /* CHAR_IS_UNSIGNED */
70 
71 #endif /* HAVE_UNSIGNED_CHAR */
72 
73 #define MAXJSAMPLE 255
74 #define CENTERJSAMPLE 128
75 
76 #endif /* BITS_IN_JSAMPLE == 8 */
77 
78 
79 #if BITS_IN_JSAMPLE == 12
80 /* JSAMPLE should be the smallest type that will hold the values 0..4095.
81  * On nearly all machines "short" will do nicely.
82  */
83 
84 typedef short JSAMPLE;
85 #define GETJSAMPLE(value) ((int) (value))
86 
87 #define MAXJSAMPLE 4095
88 #define CENTERJSAMPLE 2048
89 
90 #endif /* BITS_IN_JSAMPLE == 12 */
91 
92 
93 /* Representation of a DCT frequency coefficient.
94  * This should be a signed value of at least 16 bits; "short" is usually OK.
95  * Again, we allocate large arrays of these, but you can change to int
96  * if you have memory to burn and "short" is really slow.
97  */
98 
99 typedef short JCOEF;
100 
101 
102 /* Compressed datastreams are represented as arrays of JOCTET.
103  * These must be EXACTLY 8 bits wide, at least once they are written to
104  * external storage. Note that when using the stdio data source/destination
105  * managers, this is also the data type passed to fread/fwrite.
106  */
107 
108 #ifdef HAVE_UNSIGNED_CHAR
109 
110 typedef unsigned char JOCTET;
111 #define GETJOCTET(value) (value)
112 
113 #else /* not HAVE_UNSIGNED_CHAR */
114 
115 typedef char JOCTET;
116 #ifdef CHAR_IS_UNSIGNED
117 #define GETJOCTET(value) (value)
118 #else
119 #define GETJOCTET(value) ((value) & 0xFF)
120 #endif /* CHAR_IS_UNSIGNED */
121 
122 #endif /* HAVE_UNSIGNED_CHAR */
123 
124 
125 /* These typedefs are used for various table entries and so forth.
126  * They must be at least as wide as specified; but making them too big
127  * won't cost a huge amount of memory, so we don't provide special
128  * extraction code like we did for JSAMPLE. (In other words, these
129  * typedefs live at a different point on the speed/space tradeoff curve.)
130  */
131 
132 /* UINT8 must hold at least the values 0..255. */
133 
134 #ifdef HAVE_UNSIGNED_CHAR
135 typedef unsigned char UINT8;
136 #else /* not HAVE_UNSIGNED_CHAR */
137 #ifdef CHAR_IS_UNSIGNED
138 typedef char UINT8;
139 #else /* not CHAR_IS_UNSIGNED */
140 typedef short UINT8;
141 #endif /* CHAR_IS_UNSIGNED */
142 #endif /* HAVE_UNSIGNED_CHAR */
143 
144 /* UINT16 must hold at least the values 0..65535. */
145 
146 #ifdef HAVE_UNSIGNED_SHORT
147 typedef unsigned short UINT16;
148 #else /* not HAVE_UNSIGNED_SHORT */
149 typedef unsigned int UINT16;
150 #endif /* HAVE_UNSIGNED_SHORT */
151 
152 /* INT16 must hold at least the values -32768..32767. */
153 
154 #ifndef XMD_H /* X11/xmd.h correctly defines INT16 */
155 typedef short INT16;
156 #endif
157 
158 /* INT32 must hold at least signed 32-bit values. */
159 
160 // modified by Michele Bosi for Visualization Library
161 #if defined(_WIN32)
162  typedef signed int INT32;
163 #elif !defined(XMD_H) /* X11/xmd.h correctly defines INT32 */
164  typedef long INT32;
165 #endif
166 
167 /* Datatype used for image dimensions. The JPEG standard only supports
168  * images up to 64K*64K due to 16-bit fields in SOF markers. Therefore
169  * "unsigned int" is sufficient on all machines. However, if you need to
170  * handle larger images and you don't mind deviating from the spec, you
171  * can change this datatype.
172  */
173 
174 typedef unsigned int JDIMENSION;
175 
176 #define JPEG_MAX_DIMENSION 65500L /* a tad under 64K to prevent overflows */
177 
178 
179 /* These macros are used in all function definitions and extern declarations.
180  * You could modify them if you need to change function linkage conventions;
181  * in particular, you'll need to do that to make the library a Windows DLL.
182  * Another application is to make all functions global for use with debuggers
183  * or code profilers that require it.
184  */
185 
186 /* a function called through method pointers: */
187 #define METHODDEF(type) static type
188 /* a function used only in its module: */
189 #define LOCAL(type) static type
190 /* a function referenced thru EXTERNs: */
191 #define GLOBAL(type) type
192 /* a reference to a GLOBAL function: */
193 #define EXTERN(type) extern type
194 
195 
196 /* This macro is used to declare a "method", that is, a function pointer.
197  * We want to supply prototype parameters if the compiler can cope.
198  * Note that the arglist parameter must be parenthesized!
199  * Again, you can customize this if you need special linkage keywords.
200  */
201 
202 #ifdef HAVE_PROTOTYPES
203 #define JMETHOD(type,methodname,arglist) type (*methodname) arglist
204 #else
205 #define JMETHOD(type,methodname,arglist) type (*methodname) ()
206 #endif
207 
208 
209 /* Here is the pseudo-keyword for declaring pointers that must be "far"
210  * on 80x86 machines. Most of the specialized coding for 80x86 is handled
211  * by just saying "FAR *" where such a pointer is needed. In a few places
212  * explicit coding is needed; see uses of the NEED_FAR_POINTERS symbol.
213  */
214 
215 // Modified by Michele Bosi for Visualization Library
216 //#ifdef NEED_FAR_POINTERS
217 // #define FAR far
218 //#else
219 // #define FAR
220 //#endif
221 #ifndef FAR
222  #define FAR
223 #endif
224 
225 
226 /*
227  * On a few systems, type boolean and/or its values FALSE, TRUE may appear
228  * in standard header files. Or you may have conflicts with application-
229  * specific header files that you want to include together with these files.
230  * Defining HAVE_BOOLEAN before including jpeglib.h should make it work.
231  */
232 
233 #ifndef HAVE_BOOLEAN
234 typedef int boolean;
235 #endif
236 #ifndef FALSE /* in case these macros already exist */
237 #define FALSE 0 /* values of boolean */
238 #endif
239 #ifndef TRUE
240 #define TRUE 1
241 #endif
242 
243 
244 /*
245  * The remaining options affect code selection within the JPEG library,
246  * but they don't need to be visible to most applications using the library.
247  * To minimize application namespace pollution, the symbols won't be
248  * defined unless JPEG_INTERNALS or JPEG_INTERNAL_OPTIONS has been defined.
249  */
250 
251 #ifdef JPEG_INTERNALS
252 #define JPEG_INTERNAL_OPTIONS
253 #endif
254 
255 #ifdef JPEG_INTERNAL_OPTIONS
256 
257 
258 /*
259  * These defines indicate whether to include various optional functions.
260  * Undefining some of these symbols will produce a smaller but less capable
261  * library. Note that you can leave certain source files out of the
262  * compilation/linking process if you've #undef'd the corresponding symbols.
263  * (You may HAVE to do that if your compiler doesn't like null source files.)
264  */
265 
266 /* Arithmetic coding is unsupported for legal reasons. Complaints to IBM. */
267 
268 /* Capability options common to encoder and decoder: */
269 
270 #define DCT_ISLOW_SUPPORTED /* slow but accurate integer algorithm */
271 #define DCT_IFAST_SUPPORTED /* faster, less accurate integer method */
272 #define DCT_FLOAT_SUPPORTED /* floating-point: accurate, fast on fast HW */
273 
274 /* Encoder capability options: */
275 
276 #undef C_ARITH_CODING_SUPPORTED /* Arithmetic coding back end? */
277 #define C_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
278 #define C_PROGRESSIVE_SUPPORTED /* Progressive JPEG? (Requires MULTISCAN)*/
279 #define ENTROPY_OPT_SUPPORTED /* Optimization of entropy coding parms? */
280 /* Note: if you selected 12-bit data precision, it is dangerous to turn off
281  * ENTROPY_OPT_SUPPORTED. The standard Huffman tables are only good for 8-bit
282  * precision, so jchuff.c normally uses entropy optimization to compute
283  * usable tables for higher precision. If you don't want to do optimization,
284  * you'll have to supply different default Huffman tables.
285  * The exact same statements apply for progressive JPEG: the default tables
286  * don't work for progressive mode. (This may get fixed, however.)
287  */
288 #define INPUT_SMOOTHING_SUPPORTED /* Input image smoothing option? */
289 
290 /* Decoder capability options: */
291 
292 #undef D_ARITH_CODING_SUPPORTED /* Arithmetic coding back end? */
293 #define D_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
294 #define D_PROGRESSIVE_SUPPORTED /* Progressive JPEG? (Requires MULTISCAN)*/
295 #define SAVE_MARKERS_SUPPORTED /* jpeg_save_markers() needed? */
296 #define BLOCK_SMOOTHING_SUPPORTED /* Block smoothing? (Progressive only) */
297 #define IDCT_SCALING_SUPPORTED /* Output rescaling via IDCT? */
298 #undef UPSAMPLE_SCALING_SUPPORTED /* Output rescaling at upsample stage? */
299 #define UPSAMPLE_MERGING_SUPPORTED /* Fast path for sloppy upsampling? */
300 #define QUANT_1PASS_SUPPORTED /* 1-pass color quantization? */
301 #define QUANT_2PASS_SUPPORTED /* 2-pass color quantization? */
302 
303 /* more capability options later, no doubt */
304 
305 
306 /*
307  * Ordering of RGB data in scanlines passed to or from the application.
308  * If your application wants to deal with data in the order B,G,R, just
309  * change these macros. You can also deal with formats such as R,G,B,X
310  * (one extra byte per pixel) by changing RGB_PIXELSIZE. Note that changing
311  * the offsets will also change the order in which colormap data is organized.
312  * RESTRICTIONS:
313  * 1. The sample applications cjpeg,djpeg do NOT support modified RGB formats.
314  * 2. These macros only affect RGB<=>YCbCr color conversion, so they are not
315  * useful if you are using JPEG color spaces other than YCbCr or grayscale.
316  * 3. The color quantizer modules will not behave desirably if RGB_PIXELSIZE
317  * is not 3 (they don't understand about dummy color components!). So you
318  * can't use color quantization if you change that value.
319  */
320 
321 #define RGB_RED 0 /* Offset of Red in an RGB scanline element */
322 #define RGB_GREEN 1 /* Offset of Green */
323 #define RGB_BLUE 2 /* Offset of Blue */
324 #define RGB_PIXELSIZE 3 /* JSAMPLEs per RGB scanline element */
325 
326 
327 /* Definitions for speed-related optimizations. */
328 
329 
330 /* If your compiler supports inline functions, define INLINE
331  * as the inline keyword; otherwise define it as empty.
332  */
333 
334 #ifndef INLINE
335 #ifdef __GNUC__ /* for instance, GNU C knows about inline */
336 #define INLINE __inline__
337 #endif
338 #ifndef INLINE
339 #define INLINE /* default is to define it as empty */
340 #endif
341 #endif
342 
343 
344 /* On some machines (notably 68000 series) "int" is 32 bits, but multiplying
345  * two 16-bit shorts is faster than multiplying two ints. Define MULTIPLIER
346  * as short on such a machine. MULTIPLIER must be at least 16 bits wide.
347  */
348 
349 #ifndef MULTIPLIER
350 #define MULTIPLIER int /* type for fastest integer multiply */
351 #endif
352 
353 
354 /* FAST_FLOAT should be either float or double, whichever is done faster
355  * by your compiler. (Note that this type is only used in the floating point
356  * DCT routines, so it only matters if you've defined DCT_FLOAT_SUPPORTED.)
357  * Typically, float is faster in ANSI C compilers, while double is faster in
358  * pre-ANSI compilers (because they insist on converting to double anyway).
359  * The code below therefore chooses float if we have ANSI-style prototypes.
360  */
361 
362 #ifndef FAST_FLOAT
363 #ifdef HAVE_PROTOTYPES
364 #define FAST_FLOAT float
365 #else
366 #define FAST_FLOAT double
367 #endif
368 #endif
369 
370 #endif /* JPEG_INTERNAL_OPTIONS */
char JSAMPLE
Definition: jmorecfg.h:64
short INT16
Definition: jmorecfg.h:155
short JCOEF
Definition: jmorecfg.h:99
long INT32
Definition: jmorecfg.h:164
int boolean
Definition: jmorecfg.h:234
short UINT8
Definition: jmorecfg.h:140
unsigned int UINT16
Definition: jmorecfg.h:149
unsigned int JDIMENSION
Definition: jmorecfg.h:174
char JOCTET
Definition: jmorecfg.h:115